Date: Thu, 14 Jun 2018 23:37:48 -0700 From: Mark Millard <marklmi@yahoo.com> To: bob prohaska <fbsd@www.zefox.net> Cc: Warner Losh <imp@bsdimp.com>, freebsd-arm@freebsd.org, "Rodney W. Grimes" <freebsd-rwg@pdx.rh.cn85.dnsmgr.net> Subject: Re: GPT vs MBR for swap devices Message-ID: <834EA7A6-B567-436F-96B2-0C75FACA3FF9@yahoo.com> In-Reply-To: <20180615051527.GB37370@www.zefox.net> References: <20180614175622.GC35161@www.zefox.net> <201806142110.w5ELAL0N046840@pdx.rh.CN85.dnsmgr.net> <20180615035225.GA37370@www.zefox.net> <CANCZdfoNasSpvEN-y3bzsDfWT=_atfp62AKvdpwK8bUQKi=bgA@mail.gmail.com> <20180615051527.GB37370@www.zefox.net>
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# vmstat -c -w 5
procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr da0 ad0 in sy cs =
us sy id
1 0 0 416M 224M 1647 1 0 0 1856 142 0 0 144 1791 1024 =
4 2 94
0 0 0 416M 224M 9 0 0 0 0 1 0 0 4 85 116 =
0 0 100
0 0 0 416M 224M 12 0 0 0 0 1 0 0 2 93 113 =
0 0 100
0 0 0 416M 224M 9 0 0 0 2 1 1 0 4 64 121 =
0 0 100
On 2018-Jun-14, at 10:15 PM, bob prohaska <fbsd at www.zefox.net> wrote:
> On Thu, Jun 14, 2018 at 10:00:59PM -0600, Warner Losh wrote:
>>=20
>> I think that's because USB flash can't swap fast enough to keep up =
with the
>> page demand. You might be able to confirm this by looking at the =
write
>> rates to the swap portions for the various other media with gstat.=20
>=20
> I'll try capturing vmstat -c -w 5 to a file, but will need help=20
> interpreting the results. It seems particularly hard to correlate
> vmstat output with corresponding compilation activity.=20
>=20
>> . . .
When I look at:
# vmstat -c -w 5
procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr da0 ad0 in sy cs =
us sy id
1 0 0 416M 224M 1647 1 0 0 1856 142 0 0 144 1791 1024 =
4 2 94
0 0 0 416M 224M 9 0 0 0 0 1 0 0 4 85 116 =
0 0 100
0 0 0 416M 224M 12 0 0 0 0 1 0 0 2 93 113 =
0 0 100
0 0 0 416M 224M 9 0 0 0 2 1 1 0 4 64 121 =
0 0 100
. . .
and "man vmstat" I do not see any column that is the swap space
usage (nor any combination of columns to do such a calculation
from).
I do not expect that vmstat reports what you are likely/primarily
looking for.
An example is "avm" which for which the man page reports:
. . . Note that the entire
memory object's size is considered mapped even if only a =
subset
of the object's pages are currently mapped. This statistic =
is
not related to the active page queue which is used to track =
real
memory.
The free list size ("fre") is not sufficient either.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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